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Why Draining Your Irrigation System is Important
Draining your irrigation system is essential to prevent freezing, pipe damage, and costly repairs. When water remains in the pipes during cold weather, it can freeze and expand, leading to cracks or bursts. Properly draining the system ensures longevity and efficiency.
Types of Irrigation System Drainage Methods
Before you start, it’s important to understand the three main ways to drain an irrigation system:
1. Manual Drain Method
This method is used when manual valves are installed at the low points of the system.
2. Automatic Drain Method
Some systems are equipped with automatic drain valves that release water when the pressure drops.
3. Blowout Method
This method involves using compressed air to force water out of the pipes.
How to Drain Irrigation System: Step-by-Step Guide
Step 1: Turn Off the Water Supply
Before draining, shut off the main water supply to prevent more water from entering the system.
Step 2: Shut Down the Controller
If you have an automatic sprinkler system, turn off the controller to stop scheduled watering cycles.
Step 3: Drain Water Using the Appropriate Method
Choose the drainage method that matches your system type:
Manual Drain Method
- Locate the manual drain valves.
- Open each valve to release water.
- Keep them open until all the water drains out.
Automatic Drain Method
- Shut off the water supply.
- Activate a sprinkler zone to release pressure.
- The system’s automatic drain valves should release remaining water.
Blowout Method (Using Compressed Air)
- Attach an air compressor to the system’s blowout port.
- Set the air pressure between 50–80 PSI (avoid high pressure to prevent damage).
- Start with the farthest sprinkler zone and gradually move to the closest.
- Run air until all water is expelled.
⚠Important: If you’re unsure about this method, consult a professional to avoid damaging your system.
Step 4: Drain the Backflow Preventer
- If your system has a backflow preventer, open its drain valves.
- Tilt it slightly to remove any trapped water.
Step 5: Insulate Exposed Pipes
- Wrap any above-ground pipes and valves with foam insulation to protect against cold temperatures.
Step 6: Store Equipment Properly
- Remove hose connections and store them in a dry place.
- Keep the irrigation system valves partially open to prevent pressure buildup.
Preventive Tips for a Long-Lasting Irrigation System
- Drain your system before the first freeze of the season.
- Check for leaks or damage after draining.
- Schedule regular maintenance to keep the system running efficiently.
- Use a professional service if you are unsure about the process.
When to Call a Professional
If you’re unfamiliar with the blowout method or your irrigation system is complex, it’s best to hire a professional. Incorrect drainage can cause serious damage, leading to expensive repairs.
Final Thoughts
Draining your irrigation system is a crucial step in winterizing your lawn care routine. By following the right method, you can prevent pipe damage, freezing issues, and costly repairs. Whether you use the manual, automatic, or blowout method, regular maintenance ensures your system is ready for the next watering season.
Frequently Asked Questions (FAQs)
1. When should I drain my irrigation system?
Drain your system before the first freeze, usually in late fall.
2. Can I drain my irrigation system without an air compressor?
Yes, if your system has manual or automatic drain valves, you can release water without using an air compressor.
3. What happens if I don’t drain my irrigation system?
If water remains in the pipes, it can freeze and expand, causing cracks, leaks, or burst pipes.
4. How much does it cost to have a professional drain my irrigation system?
The cost varies but typically ranges from $50 to $200, depending on system size and location.
5. Can I use antifreeze in my irrigation system?
No, antifreeze is toxic and not safe for irrigation systems. Stick to proper drainage methods.
By following these steps, you can keep your irrigation system safe and avoid winter damage!
